A friend brought me this old wah pedal that he wanted me to repair. I took the opportunity to trace the circuit. Here are a few pictures of my work. Click on the pictures to read more.
Here is a quick demo I did with a distorted sound. I normally never use wah pedals, so this demo kinda sucks... :P Signal chain is: Gibon SG - NU-WA - Orange Micro Terror - 1x12 cab
This is the schematic I ended up with. It's not confirmed yet. I believe it's correct, but the second transistor is not identified. More info: http://freestompboxes.org/viewtopic.php?f=19&t=25004